c5e30cc02b
I don't want people to override the mutex when allocating a TTY. It has to be there, to keep drivers like syscons happy. So I'm creating a tty_alloc_mutex() which can be used in those cases. tty_alloc_mutex() should eventually be removed. The advantage of this approach, is that we can just remove a function, without breaking the regular API in the future.
390 lines
9.1 KiB
C
390 lines
9.1 KiB
C
/*-
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* Copyright (c) 2003 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/fcntl.h>
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#include <sys/interrupt.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/reboot.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <sys/termios.h>
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#include <sys/tty.h>
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#include <machine/resource.h>
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#include <machine/stdarg.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_cpu.h>
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#include "uart_if.h"
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static cn_probe_t uart_cnprobe;
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static cn_init_t uart_cninit;
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static cn_term_t uart_cnterm;
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static cn_getc_t uart_cngetc;
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static cn_putc_t uart_cnputc;
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CONSOLE_DRIVER(uart);
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static struct uart_devinfo uart_console;
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static void
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uart_cnprobe(struct consdev *cp)
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{
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cp->cn_pri = CN_DEAD;
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KASSERT(uart_console.cookie == NULL, ("foo"));
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if (uart_cpu_getdev(UART_DEV_CONSOLE, &uart_console))
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return;
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if (uart_probe(&uart_console))
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return;
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strlcpy(cp->cn_name, uart_driver_name, sizeof(cp->cn_name));
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cp->cn_pri = (boothowto & RB_SERIAL) ? CN_REMOTE : CN_NORMAL;
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cp->cn_arg = &uart_console;
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}
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static void
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uart_cninit(struct consdev *cp)
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{
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struct uart_devinfo *di;
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/*
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* Yedi trick: we need to be able to define cn_dev before we go
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* single- or multi-user. The problem is that we don't know at
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* this time what the device will be. Hence, we need to link from
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* the uart_devinfo to the consdev that corresponds to it so that
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* we can define cn_dev in uart_bus_attach() when we find the
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* device during bus enumeration. That's when we'll know what the
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* the unit number will be.
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*/
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di = cp->cn_arg;
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KASSERT(di->cookie == NULL, ("foo"));
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di->cookie = cp;
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di->type = UART_DEV_CONSOLE;
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uart_add_sysdev(di);
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uart_init(di);
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}
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static void
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uart_cnterm(struct consdev *cp)
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{
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uart_term(cp->cn_arg);
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}
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static void
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uart_cnputc(struct consdev *cp, int c)
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{
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uart_putc(cp->cn_arg, c);
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}
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static int
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uart_cngetc(struct consdev *cp)
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{
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return (uart_poll(cp->cn_arg));
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}
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static int
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uart_tty_open(struct tty *tp)
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{
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struct uart_softc *sc;
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sc = tty_softc(tp);
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if (sc == NULL || sc->sc_leaving)
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return (ENXIO);
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sc->sc_opened = 1;
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return (0);
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}
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static void
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uart_tty_close(struct tty *tp)
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{
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struct uart_softc *sc;
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sc = tty_softc(tp);
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if (sc == NULL || sc->sc_leaving || !sc->sc_opened)
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return;
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if (sc->sc_hwiflow)
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UART_IOCTL(sc, UART_IOCTL_IFLOW, 0);
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if (sc->sc_hwoflow)
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UART_IOCTL(sc, UART_IOCTL_OFLOW, 0);
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if (sc->sc_sysdev == NULL)
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UART_SETSIG(sc, SER_DDTR | SER_DRTS);
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wakeup(sc);
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sc->sc_opened = 0;
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return;
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}
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static void
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uart_tty_outwakeup(struct tty *tp)
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{
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struct uart_softc *sc;
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sc = tty_softc(tp);
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if (sc == NULL || sc->sc_leaving)
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return;
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/*
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* Handle input flow control. Note that if we have hardware support,
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* we don't do anything here. We continue to receive until our buffer
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* is full. At that time we cannot empty the UART itself and it will
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* de-assert RTS for us. In that situation we're completely stuffed.
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* Without hardware support, we need to toggle RTS ourselves.
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*/
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if ((tp->t_termios.c_cflag & CRTS_IFLOW) && !sc->sc_hwiflow) {
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#if 0
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/*if ((tp->t_state & TS_TBLOCK) &&
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(sc->sc_hwsig & SER_RTS))
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UART_SETSIG(sc, SER_DRTS);
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else */ if (/*!(tp->t_state & TS_TBLOCK) &&*/
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!(sc->sc_hwsig & SER_RTS))
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UART_SETSIG(sc, SER_DRTS|SER_RTS);
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#endif
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/* XXX: we should use inwakeup to implement this! */
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if (!(sc->sc_hwsig & SER_RTS))
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UART_SETSIG(sc, SER_DRTS|SER_RTS);
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}
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if (sc->sc_txbusy)
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return;
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sc->sc_txdatasz = ttydisc_getc(tp, sc->sc_txbuf, sc->sc_txfifosz);
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if (sc->sc_txdatasz != 0)
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UART_TRANSMIT(sc);
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}
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static int
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uart_tty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
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{
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struct uart_softc *sc;
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sc = tty_softc(tp);
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switch (cmd) {
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case TIOCSBRK:
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UART_IOCTL(sc, UART_IOCTL_BREAK, 1);
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return (0);
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case TIOCCBRK:
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UART_IOCTL(sc, UART_IOCTL_BREAK, 0);
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return (0);
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default:
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return pps_ioctl(cmd, data, &sc->sc_pps);
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}
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}
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static int
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uart_tty_param(struct tty *tp, struct termios *t)
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{
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struct uart_softc *sc;
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int databits, parity, stopbits;
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sc = tty_softc(tp);
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if (sc == NULL || sc->sc_leaving)
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return (ENODEV);
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if (t->c_ispeed != t->c_ospeed && t->c_ospeed != 0)
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return (EINVAL);
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/* Fixate certain parameters for system devices. */
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if (sc->sc_sysdev != NULL) {
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t->c_ispeed = t->c_ospeed = sc->sc_sysdev->baudrate;
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t->c_cflag |= CLOCAL;
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t->c_cflag &= ~HUPCL;
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}
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if (t->c_ospeed == 0) {
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UART_SETSIG(sc, SER_DDTR | SER_DRTS);
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return (0);
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}
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switch (t->c_cflag & CSIZE) {
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case CS5: databits = 5; break;
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case CS6: databits = 6; break;
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case CS7: databits = 7; break;
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default: databits = 8; break;
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}
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stopbits = (t->c_cflag & CSTOPB) ? 2 : 1;
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if (t->c_cflag & PARENB)
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parity = (t->c_cflag & PARODD) ? UART_PARITY_ODD
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: UART_PARITY_EVEN;
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else
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parity = UART_PARITY_NONE;
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if (UART_PARAM(sc, t->c_ospeed, databits, stopbits, parity) != 0)
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return (EINVAL);
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UART_SETSIG(sc, SER_DDTR | SER_DTR);
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/* Set input flow control state. */
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if (!sc->sc_hwiflow) {
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/* if ((t->c_cflag & CRTS_IFLOW) && (tp->t_state & TS_TBLOCK))
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UART_SETSIG(sc, SER_DRTS);
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else */
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UART_SETSIG(sc, SER_DRTS | SER_RTS);
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} else
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UART_IOCTL(sc, UART_IOCTL_IFLOW, (t->c_cflag & CRTS_IFLOW));
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/* Set output flow control state. */
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if (sc->sc_hwoflow)
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UART_IOCTL(sc, UART_IOCTL_OFLOW, (t->c_cflag & CCTS_OFLOW));
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return (0);
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}
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static int
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uart_tty_modem(struct tty *tp, int biton, int bitoff)
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{
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struct uart_softc *sc;
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sc = tty_softc(tp);
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if (biton != 0 || bitoff != 0)
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UART_SETSIG(sc, SER_DELTA(bitoff|biton) | biton);
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return (sc->sc_hwsig);
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}
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void
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uart_tty_intr(void *arg)
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{
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struct uart_softc *sc = arg;
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struct tty *tp;
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int c, err = 0, pend, sig, xc;
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if (sc->sc_leaving)
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return;
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pend = atomic_readandclear_32(&sc->sc_ttypend);
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if (!(pend & SER_INT_MASK))
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return;
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tp = sc->sc_u.u_tty.tp;
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tty_lock(tp);
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if (pend & SER_INT_RXREADY) {
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while (!uart_rx_empty(sc) /* && !(tp->t_state & TS_TBLOCK)*/) {
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xc = uart_rx_get(sc);
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c = xc & 0xff;
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if (xc & UART_STAT_FRAMERR)
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err |= TRE_FRAMING;
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if (xc & UART_STAT_OVERRUN)
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err |= TRE_OVERRUN;
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if (xc & UART_STAT_PARERR)
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err |= TRE_PARITY;
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ttydisc_rint(tp, c, err);
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}
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}
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if (pend & SER_INT_BREAK)
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ttydisc_rint(tp, 0, TRE_BREAK);
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if (pend & SER_INT_SIGCHG) {
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sig = pend & SER_INT_SIGMASK;
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if (sig & SER_DDCD)
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ttydisc_modem(tp, sig & SER_DCD);
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if ((sig & SER_DCTS) && (tp->t_termios.c_cflag & CCTS_OFLOW) &&
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!sc->sc_hwoflow) {
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if (sig & SER_CTS)
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uart_tty_outwakeup(tp);
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}
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}
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if (pend & SER_INT_TXIDLE)
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uart_tty_outwakeup(tp);
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ttydisc_rint_done(tp);
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tty_unlock(tp);
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}
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static void
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uart_tty_free(void *arg)
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{
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/*
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* XXX: uart(4) could reuse the device unit number before it is
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* being freed by the TTY layer. We should use this hook to free
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* the device unit number, but unfortunately newbus does not
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* seem to support such a construct.
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*/
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}
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static struct ttydevsw uart_tty_class = {
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.tsw_flags = TF_INITLOCK|TF_CALLOUT,
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.tsw_open = uart_tty_open,
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.tsw_close = uart_tty_close,
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.tsw_outwakeup = uart_tty_outwakeup,
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.tsw_ioctl = uart_tty_ioctl,
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.tsw_param = uart_tty_param,
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.tsw_modem = uart_tty_modem,
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.tsw_free = uart_tty_free,
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};
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int
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uart_tty_attach(struct uart_softc *sc)
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{
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struct tty *tp;
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int unit;
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sc->sc_u.u_tty.tp = tp = tty_alloc(&uart_tty_class, sc);
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unit = device_get_unit(sc->sc_dev);
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if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) {
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sprintf(((struct consdev *)sc->sc_sysdev->cookie)->cn_name,
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"ttyu%r", unit);
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tty_init_console(tp, 0);
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}
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swi_add(&tty_intr_event, uart_driver_name, uart_tty_intr, sc, SWI_TTY,
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INTR_TYPE_TTY, &sc->sc_softih);
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tty_makedev(tp, NULL, "u%r", unit);
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return (0);
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}
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int
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uart_tty_detach(struct uart_softc *sc)
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{
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struct tty *tp;
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tp = sc->sc_u.u_tty.tp;
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tty_lock(tp);
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swi_remove(sc->sc_softih);
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tty_rel_gone(tp);
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return (0);
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}
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